Snip: "Windows Graphics Foundation clearly defines, with literally no wiggle room, what the hardware and driver should do with regards to basic texture filtering, anisotropic filtering and texture and geometry antialiasing.

The result, after discussion with ATI and NVIDIA yesterday? Turn on trilinear anisotropic filtering at 16X and apply multi-sample anti-aliasing and both ATI and NVIDIA's hardware and driver will, via WGF's strict notions of what comprises correct filtering, render identical images, with only the smallest of mathematical differences tolerated."